1. It would cost thousands of pounds
2. It would confuse people
3. It would make people have accidents
4. Of course we all want it to be in Welsh but at times like these we have to tighten our belts, it's a luxury we can't afford, we could be spending the money on children in hospital, people will have to go without their operations if you have it in Welsh ... [&c. &c. ad infinitum - increasingly frantic variations on 1.]
5. It isn't compatible with the software
6. But everyone speaks English anyway
7. It's too much work to have it in Welsh, so if it has to be in Welsh as well you can't have it at all
8. It can't be translated because it is a brand name
9. The Welsh version is a work in progress
10. "You can never have it in Welsh because you have an insatiable appetite; if you have it in Welsh you will never be satisfied, you will want more and more!" - or words to that effect; paraphrasing the late Lord Tonypandy
Have I missed any?